Looking for some insight on 5+ string spacing. I'm considering a Thumb NT in either a 4 or 5 string. I have 19mm spacing on my 4-strings but felt very comfortable on the 16.5mm spacing of the Thumb NT5. I've always had fours, never really dealt with spacing issues since most were about the same. My question for those of you that have experience with both is this: Is it reasonable to go back & forth between two or more basses with different string spacing? For those that currently own several basses, do you maintain the same spacing on each? TIA.